Hybrid plasmonic whispering gallery mode microbottle resonator

Mohd Nasir, Mohd Narizee, Senthil Murugan, G. and Zervas, Michalis N. (2025) Hybrid plasmonic whispering gallery mode microbottle resonator. Optical Fiber Technology, 90, [104131]. (doi:10.1016/j.yofte.2025.104131).

Record type: Article

Abstract

A hybrid plasmonic whispering-gallery-mode (WGM) microbottle resonator (MBR) supporting hybridized surface plasmon polaritons (SPPs) is demonstrated. A thin gold film was deposited from one side of the MBR and covers only half of the resonator surface with a meniscus cross-section shape and tapered edges. Composite SPPs Q-factor of up to 850 is achievable through efficient coupling from the dielectric part of the hybrid-MBR. Lorentzian fitting on the measured data revealed that these composite SPPs comprised of three overlapping resonances with Q-factor of up to 2500. It is also shown that the excitation strength of the individual resonances depends on the relative orientation between the excitation tapered optical fibre and the thin gold meniscus. FDTD modelling reproduced accurately the experimental spectral characteristics.

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